IBPSA2007

Thermal stratification in solar tanks is essential for a better performance of energy systems where these tanks are integrated. As a consequence, various technological solutions allow, on the one hand, to support stratification and, on the other hand, to decrease its disturbance. A state of the art on existing technologies and the various levels of modeling leads us to propose a pressure zonal model to predict annual performances of a generic solar tank.

Based on results from a field survey campaign, this paper describes three new developments which have been integrated to provide for a comprehensive basis for the evaluation of overheating risk in offices. Firstly, a set of logistic regression equations have been derived to predict the probability of office occupants’ adaptation of personal and environmental characteristics. Secondly, empirical adaptive increments (offsets in comfort temperature) have been derived for each of these modes of adaptation.

The elements and classification of ground source heat pumps (GSHP) are expounded and its prospects in the Yangtze River Area of China were also indicated in the paper. The energy consumption of a model building in the area was simulated with eQUEST tool. Furthermore, the monthly and annual HVAC electric consumption of air source heat pumps (ASHP) and GSHP are contrasted and analyzed, and it is concluded that the GSHP is more efficient than conventional ASHP in the Yangtze River Area.

The moving human (MH) influences the airflow and contaminant distribution, this paper use the commerce software FLUENT6.2 to simulate the influences of the MH to the airflow and TVOCs distribution in both mixing ventilation and placement ventilation. In a three-dimension ventilation room, a pollutant source (TVOCs) was located on the floor and a flesh in a certain zone moving was assumed,  and the unsteady, k-ξ turbulent model be used, According to the simulation results, we studied the influence of MH in the indoor air quality in both mixing ventilation and displacement ventilation.

A data set of myriad and time-varying inhabitant-behavior schedules with a 15-minute time resolution, generated by the authors in a previous study, is validated through a comparison analysis. We show three comparisons. The first and second compare the estimated demand with a time series of actual utility demand. The comparisons indicate that the generated data and its algorithm, described by the authors, have an appropriate robustness.

Building indoor environment quality (IEQ) has received growing attentions lately because of the extended time people spend indoors and the increasing reports of health problems related to poor indoor environments. Recent alarms to potential terrorist attacks with airborne chemical and biological agents (CBA) have further highlighted the research needs on building vulnerability and protection.

This paper discusses the energy saving principle of frequency conversion chilled water system. Analyzes the energy saving failure reason in actual engineering from the pipe lines and the pump two aspects and gets out the reason is adopting the constant pressure difference control method. Through a simplified chilled water system, compares the pump energy saving efficiencies under constant and variable pressure difference control methods. Get out that the frequency conversion system can reach the maximum energy saving efficiency under variable pressure difference control method.

Based on the generic dynamic building energy simulation environment, EnergyPlus, the simulation model of energy recovery ventilator (ERV) is built in this paper. With different indoor temperature setpoints, the energy performance of ERV along with the availability of ERV is investigated both for Beijing and Shanghai weathers in China in terms of the ratio of heat recovery to energy supply by HVAC devices and ERV. Simulation results show that the seasonal average of the ratio is linear with indoor temperature set-points.

The research technical approach of this paper is based of the application of expert system for monitoring and fault detection in heating and air-conditioning systems. In the paper, introduces some diagnosis methods of the performance fault of heating and air conditioning, analyzes the principle.

Using DeST Program, Simulation of Space Heating/cooling Load of two buildings has been conducted for Geo-Space Heating System using Gradient Utilization Techno- logy in university campus. Simulations were conducted in accordance with the different conditions: Temperatures & RH of Rooms, different sources of Weather Data, intensity of persons, Timetable of operation & Equipment, building constructions. Also measurement has been conducted using the measurement system. Then the comparisons between simulation & measurement were made.